Hi if this is in the wrong spot feel free to move. I’m looking to remodel my fireplace and also getting a new wood fireplace insert. I’m going to end up putting granite down so the hearth outside of the insert will be higher then what is inside of the fireplace. My question is what can I put inside the fireplace to level it out so the insert sits flush with the granite. (I hope that makes sense). Attached is a photo of my fireplace and what I am having done. Thanks